i915/gvt: remove hardcoded value on crc32_start calculation

struct gvt_firmware_header has a crc32 member in which all members that
come after the that field are used to calculate it. The previous
implementation added the value '4' (crc32's u32 size) to calculate the
crc32_start offset which came across as a bit cryptic until you take a
deeper look at the struct.

This patch changes crc32_start offset to the 'version' member which is
the first member of the struct gvt_firmware_header after crc32.

It's worth mentioning that doing a build before/after this patch results
in no binary output differences.

Signed-off-by: Paulo Miguel Almeida <paulo.miguel.almeida.rodenas@gmail.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20221030033628.GA279284@mail.google.com
Reviewed-by: Zhenyu Wang <zhenyuw@linux.intel.com>

diff --git a/drivers/gpu/drm/i915/gvt/firmware.c b/drivers/gpu/drm/i915/gvt/firmware.c
index 54fe442238c6ad9f9b80de3c13533a26f3f97218..a683c22d5b64104615c378329c7268d6159953bb 100644 (file)
--- a/drivers/gpu/drm/i915/gvt/firmware.c
+++ b/drivers/gpu/drm/i915/gvt/firmware.c
@@ -104,7 +104,7 @@ static int expose_firmware_sysfs(struct intel_gvt *gvt)
 
        memcpy(p, gvt->firmware.mmio, info->mmio_size);
 
-       crc32_start = offsetof(struct gvt_firmware_header, crc32) + 4;
+       crc32_start = offsetof(struct gvt_firmware_header, version);
        h->crc32 = crc32_le(0, firmware + crc32_start, size - crc32_start);
 
        firmware_attr.size = size;